Rifling-machine.



B. M. W. HANSON. BIFLING MACHINE. APPLIUATIGN FILED Nov. 1909 Patlled M811 12, 1912.

2 SHEETS-SHEET 1.

Inventor: JTZWb/nson B. M. W. HANSON.

"IFLING MACHINE. APPLICATION FILED NOV. 6, 1909` Patented Mar.12,1912.

2 SHEETS-SHEET 2.

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ineffective machine. of this type whereby a although in Figs 1 and 2 of the i STAIRS PATENT soN, a citizen of the United. States, residing at Hartford, in the county of-Hartford and -new and useful Improvements in Rifling Machines,of which the following is a specitication. o v

`his invention relates to riling machines the 'object' oftheinvention being to provide rifle groove of greater cross sectional area at one place than at' another .can beobtained with recisioIL- -In thedrawm'gs accompanying and forming part' of the presentspecification there is illustrated in detaill one convenient lform of embodimentfof, the. invention. which to enable thoselfslcilled ,in the art to practice said invention will be set forth in detail in the following description while ,the novelty of the 'invention will be included in t-he claims succeeding said description. The inventi'onis. ofcourse not restricted to the disclosure made by said description and.` .drawings yfor many variations within the scope thereof as expressed by said claims,.

can be adopted.

Referring to said drawings, Figure 1 is a top planview ofA a 4rifling machine including the invention. Fig. 2 is a longitudinal sectional view on the line 2-2 of Fig.1. Figs, 3, 4 and 5 represent collectively the rifling rod-shown partially in Figs. 1 and 2. Like characters referl to like parts throughout the.- several views. -As briefly intimatedhereinbefore the primarypurpose of the vinvention is the production of an effective machine by which a rifle groove can be formed which is greater in cross sectional extent at one place than at another 'and the mechanism by which this relation. ismproduced can vary greatly drawings there areshown certain of the elements of a riding machine-tof known construction Awith which are associated the improvements and thellatter are of. such a character .that a. rifle f groove the'l bottom of which is tapered, is produced-and in the present instance this l tapering-ofithe .bottom of thegroove (or grooves) is at. the muzzle end ofthe barrel whether the same be gun.. .or rifle. 'The invention principally -nIFLpING-inncmnn part of .a hand or large l BENGT M. mrnnnson, or Hnmfrom), CONNECTICUT, .assIGNon-To PRATT & wH1'rNEY- l comm, or Hanrronn, ooNNncarcUr, n coRroRATIoN or JERSEY.'-

" 'epliiieano n l'ed November e, 1909. serial No. 526,593.

centers around theri'fling or cutting mechamsm and the-meansassociated therewith.

The machlne represented in Figs. 1 and 2 includes in its'organization a slide or carriage as'2 which is usually supported by a bed'3 said sli'dehaving a movement longi tudmally of said bed and mechanism, in

practice, being provided to automatically operate said slide back and forth. upper side of said slide 2 is a head as 4e and a complemental standard or upright 5V which jointly support for rotation a hollow spindle as' 6 with which the rifling rod, hereinafter Patented Mar. 12,1912..

On the i more particularly described, is directly'con nected. l

From. the main slide or .carriage 4 there are. shown rising the bearings or webs 7 wl'nch areconnected at their tops by a plate 8 which is provided with-suitable ways for the auxiliary slide 9 which as will be ob'- vious moves crosswisecr transversely of the bed 3. It will be also understood that as the main slide 2 travels. forward and backward it carries the auxiliaryor cross slide 9 therewith. On the underside of said auxiliary slide 9 there is fastened a rack 10 in mesh with a pinion 11 fixed to the spindle 6. lSuitably mounted over the slide 9viswhat is known as a taper bar 12 which is shown by broken -lines in Fig. 1 and saidto receive a stud 13 on the bar is grooved top .of the slide 9 it Vbeing the custom to make said stud in the form of an anti-friction roller and the groove in the taper-bar in which said roll travels, ext-ends generally the complete length thereof. The taper bar 12 as will be perceived is to the line of travel of the slide or carriage 2. As the carriage 2 advances itv carries the slide 9 therewith and owing to the fact that the roller 13 is in the Groove of the obliquely disposed bar 12 the sllde 9 on the .movement of the slide 2 is caused to move on the slide disposed obliquely 2 whereby the rack 10 and pinion 11, will. i turnathe spindle 6-so that therefore said spindle 6 has a.,.combined rotary-and fendwise movement andthis compound movement is' what is utilized to cause the t'ool connected with the said spind1e`6 to follow;1

a spiral path.

. The'foregoingwis. a somewhatbriefi-'de-A.-

scription of'a type of filling machine .now-

in use and' with which the improvements may be advantageously connected although.`

the invention is-notvlimited in this lrespect 'for said improvements can be incorporated in radically-different types of rifling machines.` l

A riding-rod. such as satisfactorily answers the requirements'is that denoted fin a general way byA 14 and which is shown in sections vin the three Figs. 3, 4 and 5. I havejtermed the part 14 a rod as this is the name it is best known by in the art of ordnance. Said rod comprises an elongated tube as' 15 the rear end of which is internally threaded to receive the shank portion ofa hollow coupling member as'lG .which has a tapered portion to fit a correspondingly shaped opening in the nose end of the spindle 6, said coupling'member being held rigidly to said spindle by a nut 17 bearing i `an elongated slot20 in the tube 15.

u. 20 as best shown in Fig. 4. The tube 15 is against opposite lugs on said coupling member from which it will be obvious that as the slide 2 and-spindle 6 are moved longitudinally of the bed, said tube15 partakes of a similar motion.

A grooving tool of efficient type is that 4denoted in ageneral way by 18 and it has a cutting head 19 which is proj ectable through The tail or hirtt portion of thetool18 has a sliding` bearing upon the interior of the tube 154 just back ofthe rear end'wall ofthe slot shown inclosing near its forward end a wedge'21 the act-ive face of which bears at all'times against the upper portion of the head 19 said wedge being normally fixed.- It might be well to state at this time that while as intimated hereinbefore this cutting tool 18 is satisfactory other kinds or an entirely different cutting mechanism might be substituted therefor. In like manner various means might be employed for operating said tool with respect to the tube 15.

In connection with the wedge 21 there is coperative an operating device as -the plunger 22 which is shown for ease of assemblage as made ,in two detachably-connected sections the inner one of which has a sliding movement in the tube 15 near the forward end thereof while the outer one.`v of which extends through the bore of a plug as 23 threaded into the extreme forward end of said tube 15 said plug having a head as 24 coperative with a head or enlargement 25 on the outer end of the outer section of saidplunger 22. The wedge 21 is )also for ease of assemblage separably connected with said plunger v22 by a pivotal connection as 26 so that acertain amount (if-lateral motion of the wedge with respect to the plunger is permitted in view of-which the intermittent or step by step advance movement of the cutting tool 18 can be effected during which `said tool moves radially of the tube 15. The square head 24 serves as a limit stop for the head 25 and it coperates with .indexing 2 and when the head 24 is thrust into thisl opening'and when the partI in r'whichffsaid opening is situated is turned the plug`28 will be movedfarther into the tube 15 thereby in:

creasing'the distance of travelof the plunger the limit of relative advancing movement of said plunger beine-reached when the head 25 strikes the heard orstop 24. -It

should be stated that as the tube 15. is ad-4 vanced the head 25 strikes afxed abutment (not shown) which arrests the movement ofthe plunger22 with the tube 15 or lcauses a relative movement of said plunger 22 andwedge 21 the consequence being that the wedge causes the tool 19 to advance outward one step, each step being repeated with 'each advancing movement .of the slide 2.' It

might be stated at this point that -the wedge 21 bears normally against a part fixed relatively thereto during'the major part' of thel operation of the machine and it therefore follows that whenthe wedge 21 is moved toward the right 'in Fig. 4 relatively to thel tube 15 said wedge forces the cutter 18 out-v ward one step. The normally. relatively fixed part shown inthe drawings Aand against which this wedge has a bearing will be hereinafter described.

The-extreme rear end of the cutting tool 18 is illustrated as having a bearing against the sleeve 27 and said tube 15 is shown as inclosing a coiled spring 28 of some 09nsiderable power preferably 4the rear endof which engages t-he shank of the coupling 16 which is relatively stationary with respect to the tube 15 and the forward end of which engages against said sleeve 27 which is slidable in the tube 15 by reason of whichV the spring tends at all times to move the cutting tool 18 forward and to hold the head-1Q 'of -the same firm and solid against the acti-ve face of the Wedge 21.. The spring therefore acts cutting tip thereofI being approximately flu i with or theplane of the circum In rifiing thev tool( ference of the'tube 15. first \travels longitudinallyr of the interior of is to move said tool'inward. fr'

the drawings the tool 18 1s f shown 1n its vextreme retracted position, the v of thebarrelblank and makes a cut and on"A the ret-uan movement of. the tool, means are" provided for retractmgthe tool to p1'event itinjuring the work. Such means arequite step causing a deepening of the grove@` The step laystep advancing means for the cutthe tube longitudinally thereof andpreff l 15' ting tool is therefore located `at one end of the `tube 15. .'As will hereinafter Aappear means are provided for so operating upon said tool as to cause the same to taper the bottoms of the rifle grooves near the muzzle end of the barrel, and the means which site end of said tube 15.

Within the tubel5 land extending longitudinallyv thereof is a rod as 29 which acts to cont-rol or actuate the wedge 21 to obtain the desired taper to which allusion has been made. This rod has a sliding movement in secures this result operates from the oppoerably itis operated in opposite directions by cam mechanism and 'spring means as will hereinafter appear, the operating means for said rod being adapted to draw or pull the same during the taperingoperation, so that the rod is not subjected to torsion as would be the case were said :rod givenA a thrust or rotated during such particular action. This rod 29V extends uninterruptedly lfrom the wedge 21 to a point beyond the rear or outer end of the spindle 6, having a sliding movement in said spindle through which it projects. outer end' of said rod 29, acolla'r 30 peripherally 'groovedto receive the lower end of 'the pendent arm 30 of the spring-plunger 31vv supported for endwise'movement by al bracket 32 on the outer bearing or standard Z The said plunger 31 is longitudinally bored to .receive the push spring 33 bearing against the closed forward end of said bore and against. a plug closing the rear open end of said'bore', the constant tendency of the spring being t-o move the plunger inward or toward the left in Figs. 1 and 2. For operating the saidy plunger in opposition to the spring thereof a cam 34 is represented the working portion of said cam being on a slant. This cam is shown as fastened to the outer side of the auxiliary slide 9, and

'its beveled surface is the means which is utilized 1n the present case to secure gradual backing off or inward movement of the cutting or grooving tool 18 on the move ment of the tube 15 into the barrel of the rifle. It will be evident that as the plunger 31 is .moved backward and forward a corresponding movement is' imparted to the rod 29 owing to the described connection between the two parts. .i Y

The head or forward end portion 35 of the rod 29 is beveled as at 36 to coperate with the wedge 21 and this head portion is preferably conneted with the body of the rod by a pin and slot joint denoted in a generalwayby 37 In Fig. 4 the endwise-movable or longitudinally-reciprocative rod 29 Y is assumed'tobe at the extreme end of its retractive or back stroke the cutting'tool 18 at this time being in its ineffective positlon. Just prior to tapering the rod 29 is moved There is shown as fastened to the;

awardedthnthwedge surface as gruta head thereof 'will act agains'tthe laterllyj movable wedge 21 to press-thesame and con-l the tool 18 outwrdcthe amount movement .depending A upon the taper 'tov be.

giveny to La rifle groove on.` its bottom. andnear the muzzle ofthe blank; 'As'the tool travels,

along fthe interiorr' of the barrel-commencing clusion of each slight movement thereof finds a solid bearing against the wedgehead 35 of the rod 29. It might be stated at-this point that the cam 34 is the means which in the present case is provided to impart' an advancing movement to the rod 29. It will be obvious that each time the tooloperates upon the gun blank the tapering and 'nor' j mal cutting operations' occur `1n sequence.

The invention, however, does not concern this particular detailbut resides rather in certainjbroad relations although it willbey apparent that the machine is so organized to taper the bottoms of the rifle grooves atv their forward ends the taper being in each case an outward one.l During both taperturned although there may be other ways the spirality of the grooves canfbe secured no1' is it essential that there-be a relative endwiseV movement between the tube 15 and 'the rod 29 or their equivalents.

J ust before the tool 18 enters the barrel blank or tube thefentering portion 34 o-f the cam 34 will be at or near the tip or inner end of the plunger 3l so that as the slide 9 follows the directionof the arrow in Fig. 1

said cam 34 can thrust the plunger 31 to the right in said figure and thereby gradually draw the rod 29 to the right also whereby the tool 19 as the sametravels along the interior of, the blank, can be permitted to gradually recede under the influence of the spring 28.

Of course-the rod 14 is being turned during tapering so as to give the tapered portion of the groove the necessary .ing and-.normal grooving'the tool isbeing lwithin the spirit of the invention by'which spirality and which naturally conforms with that of the remainder of the groove. After the tapering of the lgroove has beenl formed theA cutter 1 8 strikes against the indexed wedge 21 vby virtue of which the requisite depth of out can be made. After the tip-of the plunger 31 'has passed from-off thev beveled or active portion of the cam 34 it rides along the ined'ective or straigl'it portionv of the cam and during this time the cutting tool is operating normally or 1s making a cut in parallelism with the longirides along the tip df said plunger by reason ofwhich through the intermediate parts the .'tool 18 can be moved outward. the necessary extent'to commence on the next forward movement of the riding rod, a taper cut.

In the 'present Case the cutting of the groovesfcommences at the muzzle and is concluded at the breech of the barrel, and each groove, therefore, has a forward outwardly tapered portion. The part-s are preferably so arranged that as the riding rod 14 travels toward the right in all lche figures, cutting is ta-king'place whilefollowing the usual custom as already intimated, no cutting occurs on the opposite movement of the rod.'

Of course, it is not a matter of consequence where the cutting is commenced, but in the construction shown, it initially occurs at the place indicated. The barrel during riding is held fast in a chuck or other suitable device, the slide 2, as will be understood, during the cutting or riding action traveling toward .the right in Figs. 1 and 2. As the slide-2 moves toward the right the auxiliary slid-e9 is carried therewith, and owing to the action of the `tape-r bar 12 against the stud or antifriction roller 13 on said auxiliary slide, the latter is caused to follow the direction of the arrow in Fig. 1, thereby through the rack 10 and pinion 11 turning the riding rod'14, in the-manner already described so as to secure spirality oi the grooves. As the rod le is moved toward the left in the various lignres the plug 23 is first indexed by the head 24 being turned, as already set forth, beyond which point the head Q5 strikes a fixed abutment whereby on the continued movement of the rod toward the left, said head 25 will be thrust relatively toward and. against the head 24e, the result being that the wedge 9.1 through the described parts is moved toward the rightrelatively in Fig. 4 whereby said wedge 21 will move the cut-- ting tool 19 outward one 'step'and against the wedge which at this -time is at rest with respect to vthe rod 14. After the indexing operation and after the wedge Q1 has thrust the tool 19 outward thela-tter is in position to cnt, and when the rod 14 moves toward the right, the tip 'of the cutter 19 will be brought against the barrel at the ..muzzle, the inner end of the plunger 31 at `"rf-this'"time beingagainst the wedge or tap-er face of the former 34. At this time the two thereby mowing the rod 29 in a correspond ing direction and through said rod 29 drawing the wedge gradually away from the wedge E21 so that the tool 19 and hence the wedge 21 can move inward. This latter operation is a gradual one andv owing to the fact that the rod 1-'1 is endwise moving, the tool will initially taper the-groove, Athe taper ing operation ceasing when the plunger 31 passes od the active face of the former beyond which the groove is cut, but not tapered. The operations are repeated until the groove is of the requisite depth when a second cut is formed, indexing occuring` after each cut has been made. V

That is claimed is 1. A tubular riding rod provided with a riding tool, a second rod inclosed in said tubular rod, means for intermittently operating the riding tool whereby said tool will progressively deepen the groove, a taper controlling device coperative with the tool and operative by said Second rod, and means for pulling sai'dfseeond rod to canse the same to eiiect the action ot said taper controlling device and thereby secure tapering of the groove.

vQ. A riding rod provided with a riding tool, wedge acting against said tool to move the\same` radially of the rod, means for operating said wet ge and thereby the tool to regulate the depth of c ut, a second wedge active against the iirst wedge, means for moving the second wedge in the direction of the length of the riding` rod, and means for moving the tool in the opposite direction during the movement of the second wedge. i

3. A riding rod provided with a riding tool, a wedge acting against said tool to move the same radially of the rod, a second wedge for also controlling the tool, means for moving the second wedge longitudinally of the riding rod, and means for simultaneously moving the tool but in an opposite direction.

4L. A riding rod provided with a radially land longitudinally movable riding tool` a movably mounted wedge for shifting` sid tool radially of the rod, spring operated means acting' against the riding tool and tending to move the same longitudinally of said rod, a. second wedge controlling the position of the riding tool, and means for imparting av movement to the. second wedge in a direction opposite to the direction in which said spring operated means tends to move said riding tool.

5. A, vtubular riding rod ha ving a. slot, a riding tool within said rod, the activo portion oi the tool being movable through said slot, a wedge active againstsaid tool for moving the same radially lo thereby govern the depth of cut, a second wedge directly active against the first wedge, means for drawing the second Wedge away from the first Wedge, and means for imparting a thrust to the riiling toolin 'a direction opposite to that ofsaid draw.

6. A rilling rod provided with a riling tool, a wedge active against said btool for shifting the sanie radially of the rod. a second Wedge active directly against the first Wedge, means for pulling said second Wedgeavvay from the first Wedge in the direction of the length of the rod, and means for imparting a thrust to the tool in the direction opposite to that of the tool. 7. A rifling machine having a rifling rod provided with a rifling tool, a second. rod

inclosed in the first rod, means. for intermittently operating the riding tool whereby said tool Will progressively deepen the groove, a. taper controlling device coperative with the tool and operative by said second rod, a carrier for the ritling rod provided with a taper bar, and means for transferring the effect of said taper bar to said second rod for exerting a pull thereupon to thereby effect t-lie action of the taper controlling device.

8. A i'iiiing rod rovided with a rotary longitudinally nioiulile riliiig tool, a Wedge, a plunger lfor operating the wedge7 means for connecting the plunger and Wedge to permitl movement of the wedge radially of the rod, a second wedge operative against the first `wedge, means for pulling the second Wedge away from the lirst Wedge, and means for moving the riling tool longitudinally of the rod during tlie pulling operation aiid in a direction opposite to the pull.

9. A ritling machine comprising atubular rod provided With a riiing tool, a sec ond rod inclosed in said tubular rod,'means for pulling said second rod during the rifling operation, and means for transferring the effect of said second rod to the rifling tool to causethe act-ion of the latter during said pull.

In testimony whereof I affix my signature inv presence of two Witnesses.

BENGT M. W. HANSON. lVitnesses z W. M, STORES', H. W. KILBOURNrJ 

